His proposal is so idealistic that there are manydifficulties in putting it into practice．

It is ______ for me to follow the Australian guests because I am good at English.

ThereareseveralresearchcentersinChina________acertaindiseasecalledBirdFluisbeingstudied.

Every boy and every girl as well as some teacherswho_____ to visit the museum______ asked to be at the school gate before 6 :00in the morning

Some experts believe it is the grandparents who________ for the spoiled child.